Last week, the star proudly took to social media to show that she is now able to get in her Guardians Of The Galaxy costume which she wore in 2013.

Since filming, the star has had twin boys, Cy and Bowie, and said because of that she never expected to be able to get back into the skin tight futuristic onesie.

'Holy S---!' Zoe shocked herself on Thursday by getting back into her Guardians Of The Galaxy costume from her 2013 film

New additions: Since filming, the star has had twin boys, Cy and Bowie, (pictured with dad Marco last week) and said because of that she never expected to be able to get back into the skin tight futuristic onesie

The Avatar star captioned the shot: 'Holy S---! You guys, I had to share this, this is one of the old #guardiansofthegalaxy costumes that I wore back in 2013. After twins I can't believe I was able to slip into this.'

Giving other mothers some advice, the star said: 'It pays off to work hard! I mean it mommies of the world, if I did it you can too.'

While the star happily showed off her slimmed down frame, she told Galaxy fans not to get too excited as the costume - which she wore in the 2013 hit as sexy alien Gamora - will not be used in the sequel.

Zoe also added to the caption: '@marvel and @jamesgunn [the director] don't be mad, I'm not showing anything that hasn't been seen before... besides, aren't we designing new stuff?....'

The second installment of Guardians has not yet started filming but is due out 2017 and will once again star Chris Pratt.

Very candid: The actress (pictured in October last year a month before she gave birth) said Hollywood stars have been misleading in portraying their post-baby weight loss

Zoe, who shares her two 13-month-olds with husband Marco, has been very candid with her fans about her attempts to get into shape after her pregnancy.

Two months ago, Zoe told People Magazine that many in Hollywood were misleading moms.

The star said: 'Throughout the years that I've been in this business, women that hide in a cave and they don't come out until they're a size zero.'

'And that is a very misleading message to send out to women, especially when women here in L.A. are the skinniest women out there. And that should concern us. We're too busy thinking about our appearances and not really thinking about our mental health first as well.'

The before and after: If anything, Zoe looked like the suit was too big for her as during filming back in 2013 it was very tight

Not beating around the bush, she continued: 'I've got a booty. I've got some thighs I got to burn off all the time.'

'I feel bad for those women that get super desperate and want to bounce back three months after having a baby. Breastfeed. Stay home. Sleep.'

'Your kid is only three months old. Like what are you going to the gym for? Catch up on f**king reruns of some sort.'